(Adds more detail) BEIRUT, June 1 (Reuters) - At least fourteen people were killed in fierce fighting between Lebanese troops and Islamist militants at a Palestinian refugee camp in north Lebanon on Friday, security sources said. At least 12 people were killed inside Nahr al-Bared camp as well as two soldiers, security sources said. They said 18 soldiers were wounded but could not say whether the 12 who died inside Nahr al-Bared camp were militants or civilians. Security sources said elite forces seized several key positions of Fatah al-Islam militants and destroyed sniper nests on the northern edge of Nahr al-Bared while artillery batteries pounded the camp. The army has been battling militants in the camp -- many of them foreign fighters -- since May 20 in Lebanon's worst internal violence since the 1975-1990 civil war. At least 84 people -- 35 soldiers, 29 militants and 20 civilians -- had been killed before Friday.
